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Table 1 The bridwell interbody fusion grading system

From: Retrospective comparison of cortical bone trajectory and pedicle screw in lumbar fusion for patients over 80, including sagittal balance: a single-center study

Grade

Description

I

Fused with remodeling and trabeculae present

II

Graft intact, not fully remodeled and incorporated, but no lucency present

III

Graft intact, potential lucency present at top and bottom of graft

IV

Fusion absent with collapse/resorption of graft